Pasting Large Amount of Text Through Paste-from-Word TinyMCE button leads to Whitescreen upon publishing

Description

I needed to paste a large MS Word document into a WordPress page, so I used the Paste-from-Word button on the Visual Editor to do so. When I tried to publish the page, I got a whitescreen with the URL /wp-admin/post.php

After testing the problem in various ways, I determined that the problem arose only when the amount of words in the page were more than 10,000. The page posted fine when there were fewer than 10,000 words.

Thanks. I added that line to wp-config.php and did see an error message on the post-writing page. However, When I pasted text through the Paste-from-Word tool and then hit "Publish," I again saw a white screen. No error messages appeared.